Roentgen tube with anode turning about its longitudinal axis



June 6, 1944. K. SCHWARZER RONTGEN TUBE WITH ANODE TURNING ABOUT ITS LONGITUDINAL AXIS F iled Sept. 27, 1940 3 Sheets-Sheet 1 June 6, 1944. KQSCHWARZER 2,350,642

RONTGEN TUBE WITH ANODE TURNING ABOUT ITS LONGITUDINAL AXIS Filed Sept. 27, 1940 r 3 Sheets-Sheet 2 Kiri/Fl w i AM June 6, 1944. K. SCIHIWARZER R ON'I'GEN TUBE WITH ANODE TURNING ABOUT ITS LCNGITUDINAL AXIS' s Sheets-Shet 3 Filed Sept. 27, 1940 I Fig. 5

Patented June 6, 1944 ROENTGEN TUBE WITH ANODE TURNING'. ABOUT ITS LONGITUDINAL AXIS Kurt Schwarzer, Berlin, Germany; vested in the Alien Property Custodian Application September 2'7, 1940, Serial No. 358,686 In Germany October 14, 1939 4 Claims.

The invention relates to a novel Roentgen tube with anode turning about its longitudinal axis and equipped with two anodes, two cathodes and synchronous drive for both anodes so that, when the tube is directly connected to an alternating current-high tension, both half-cycles are utilized for the production of Roentgen rays originating at the same point of space. according to the invention, the rectifier connections with four high tension incandescent cathode rectifiers, used up to the present in all high power Roentgen arrangements, become superfluous, so that the Roentgen arrangements become much simpler and cheaper.

The two anodes are preferably constructed as half rotary bodies of substantially similar shape and oppositely directed arranged rotatable in the same space portion with corresponding coordination of a cathode to each anode. A synchronous motor may be provided as drive for each anode. The drive may, however, be effected by one single synchronous motor, the two anodes being then connected the one with the other by a coupling piece possessing high insulating capability and heat constancy, for instance of quartz glass. Also in this coupling it is advisable to balance each anode alone relative to the turning axis in order to avoid too great mechanical stressing of the coupling piece.

A Roentgen tube according to the invention is shown by way of example partly diagrammatically in the accompanying drawings, in which Fig. 1 shows a longitudinal section through the tube and Fig. 2 is a top plan view on the anodes corresponding to the section line IIH in Fig. 1.

Figs. 3 and 4 show diagrammatic circuit connections, whereby the tube operates on both halfcycles of the alternating current.

Fig. 5 shows a second form of construction of the Roentgen tube, in which two motors are used.

In the high vacuum envelope l of the Roentgen tube, said envelope consisting preferably of glass, a bearing 2, 3 respectively is inserted at the two ends each with ball bearings. for the pivot axles, 4, 5 of the two anodes 6, 1. The anodes are coupled the one with the other by an insulatin piece 8 made for instance of quartz glass. Each anode is balanced alone relatively to its turning axis by means of balancing bodies 9, ID. A motor making 3000 revolutions per minut (alternating current of 50 periods being supposed) is provided, the stator of this motor being designated by H and the rotor mounted on the turning axle 4 by H. An incandescent cathode I3 is coordinated to the anode 6, the filament voltage being fed to said cathode through the intermediary of metal By the Roentgen tube seals l4, l5 of the high vacuum envelope. The incandescent cathode I 6 with the metal seals IT, IS belongs to the anode I.

When building up the Roentgen tube according to the invention the anode 6 and the incandescent cathode It in the one half-cycle have positive potential and the anode I and the incandescent cathode [3 have negative potential. In the other half-cycle the potential distribution is inverse. In the anode position shown in the drawings the incandescent cathode I6 is negative, the anode 1 positive and Roentgen rays are emitted from the tube to the left. In the next half-cycle the anode has turned by the incandescent cathode I3 is negative and the anode 6 positive, so that Roentgen rays are emitted from the same in the same direction. The position of the focal point in the space remains unchanged.

As shown in Figs. 3 and 4, the high tension for the Roentgen tube is supplied by the transformer I9, the filament voltage for the incandescent cathode l3 by the transformer 20 and the filament voltage for the incandescent cathode l6 by the transformer 2|. The course of the circuit in the two half -cycles is indicated by arrows. The current flows in one of the half-cycles, as shown in Fig. 3, from the right hand end of the secondary winding of the high tension transformer l9 through the wire 22, the cathode It, the anode I and the wire 23 to the other pole of the high tension transformer. In the next half-cycle the anodes have turned by 180, as shown in Fig. 4. The current flows then from the left end of the secondary winding of the high tension transformer l9 through the wire 23, the cathode Hi, the anode B and the wire 22 to the other pole of the high tension transformer.

Fig. 5 shows a second embodiment of the Roentgen tube according to the invention, in which for each anode a synchronous motor is provided as drive. In this instance it is evidently very material that both motors run accurately uniformly and synchronously with the operation voltage. The pivot axle 4 of the anode 6 is journaled in the bearings 2 and 24. The motor I2 is mounted on the axle 4 and rotated by the stator H. The current is fed to the incandescent cathode l3 coordinated to the anode '6 by means of the metal seals 25, 26 of the high vacuum sleeve. The pivot axle 5 of the second anode I is journalled in the bearings 21, 28, and on this axle the rotor 29 is mounted which is rotated by the stator 30. The current is fed by the metal seals ll, l8 to the incandescent cathode l6, coordinated to this anode I.

Iclaim:

1. Roentgen tube of the rotating anode type, comprising two anodes and two cathodes; the two anodes constructed as semi-rotary bodies of substantially similar form but oppositely directed and each cathode coordinated to each anode, a synchronous drive for both anodes, so that with direct connection of the tube to an alternating current high tension both semi-cycles are utilized for the production of Roentgen rays produced at the same point in the space.

turning axis.

KURT SCI-IWARZER. 

